Food webs of two Venezuelan clear-water streams with seasonal fluctuations in hydrology /
addressed with standardized methodologies so that an accurate
| Main Author: | |
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1997.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | addressed with standardized methodologies so that an accurate allochthonous input to be of relatively little importance at and define the boundaries of AguaroGuariquito National Park. and reproduction increased during the wet season. Dietary artifacts that arose from analyzing webs that varied in data availability on food web structure. Previous studies that Both sites are influenced by seasonal fluctuations in both sites. Aquatic macrophytes and algae were the most compiled food webs from published literature have been consuming abundant invertebrate prey. As fish densities criticized for describing food web statistics from studies data sets that could be used in future analyses of food web description of an ecosystems food web could be created. This effects of seasonal environmental change and resource exploited seasonally available food resources at both sites fish densities and low capture efficiency. Piscivory higher than values reported by Winemiller, but lower than hydrology that create productive marshes during the wet importance in the webs at either site. Web connectance was important basal resources, and detritivory had little in order to standardize food web methodologies and create increased during the dry season as fish densities increased. increased, and dietary overlap decreased for most species intermediate species in the food webs at both sites was intermediate trophic level species in food webs indicated larger than recorded by other studies, and the number of Morichal Charcote and Morichal Charcotico are tributaries of Morichal Charcotico appeared to have more allochthonous input overlap was high during the wet season due to fishes pairs. Piscivory was low during the wet season due to low quality. The criticisms of earlier studies needed to be resource use by fishes, community interactions, and the season and isolated pools during the dry season. Fishes statistics. study was conducted with methods similar to Winemiller (1990) than Morichal Charcotico, however food web diagrams showed that omnivory was greater than published values. the Aguaro and Guariquito rivers, which flow to the Orinoco Two Venezuelan clear-water streams were sampled to describe values computed by other authors. The proportion of with varying methods. Patterns described may have been |
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| Item Description: | "Major subject: Wildlife and Fisheries Sciences". Vita. |
| Physical Description: | xiv, 144 leaves : illustrations, maps ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references: pages 131-143. |